A spinoff on the Sonic RP site, Kingdom Hearts: Sonic Dominion is a crossover between Sonic the Hedgehog and Kingdom Hearts. As it is a spinoff, it takes certain elements from the already-existing Sonic RP.
In the Green Hill Zone, Sonic happens to notice that Eggman is off to the Special Zone, to collect more Chaos Emeralds. As he and Shadow leap in to stop the scientist, the three are assaulted by The Heartless, and their commander, Master Xehanort. Soon enough, Sonic and Shadow find themselves entrusted with Keyblades, and they see themselves ready to fight the Heartless, along with Xehanort.
However, things don't go too well. Taking advantage of Sonic's Super form, Xehanort effectively summons Kingdom Hearts with the power of the Chaos, Sol and Master Emeralds, and only due to Sonic and Shadow, along with Queen Aleena and Mickey Mouse sealing it away is the day saved, but at a prize; the Chaos Emeralds are gone, and the Sol Emeralds are knocking out a new set of Princesses of Heart. And if that wasn't enough, a new team of baddies intend to take advantage of this. So it's up to Sonic and his friends to stop this menace!
This RP contain examples of:
- Big Bad: Sorceress Edea
- Black-and-White Morality: Sonic is forced to go through certain decisions that involve this, which is called Twilight Decisions, such as one where he could save Tails from his Superpowered Evil Side by either slamming him down with the Keyblade (Light), or stabbing him through his heart (Dark). He took the light road.
- Butt-Monkey: For the baddies, Bowser is this, to the point where they won't even let him join their group.
- The Dark Chick: Juri, Witch Princess, and Ly the Moogle
- The Dragon: Seth and Eggman Nega
- Enemy Mine: Between Sonic's friends and Eggman. But is that really news anymore?
- The Evil Genius: Doctor Wily, Albert Wesker, and Lord Galcian
- Magnificent Bastard: Of the baddies, at the moment, Nega and Wesker have the strongest shades of this.
- Sixth Ranger Traitor: Revolver Ocelot, Dimentio, and Titan Knuckles